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Not possible No problem Not exactly Not at all
must stop should stop must have stopped should have stopped
must stop should stop must have stopped should have stopped
eating to eat to eat at to eat with
ought not to can’ t don’ t have to mustn’ t
POR-IOR POR-AOR/W POR-AOR-E IOR-AOR/W
POR；IOR；AOR POR；IOR；AOR-E PORIOR；AOR-E；AOR-W POR；IOR；AOR-W
must stop should stop must have stopped should have stopped
to smoke, need smoking, have to smoke, must smoked, may
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